Type-writing machine.



A. F. W. J. VON WEDEL.

TYPE WRITING MAOHINE.

APPLICATION Hum 001'. z, 1906 Patented Jan. 11, 1910.

2 SHEETS-SHEET 1.

A. F. W. J. VON WEDEL.

TYPE WRITING MACHINE.

APPLICATION FILED 00122, 1908.

945,829. Patented Jan. 11,1910.

2 8HEETB-BHEET 2.

UNITED STATES PATENT OFFICE.

AUGUST FRIEDRICH WILHELM JULIUS VON WEDEL, OF HAMBURG, GERMANY.

TYPE-W RITING MACHINE.

Application filed October 2, 1566.

To all 1137mm it may concern:

Be it known that I, AUoIJs'r Finnnnnu VVILHELM JiTLiiJS voN \Vnnnn, asubject of the German Emperor, and resident ot llamburg. in the GermanEmpire, have invented certain. new and useful improvements in'lype-lvriting lilachines, of which the fol lowing is a speeilication.

This invention relates to type writing machines and refers moreparticularly to improvements in the type bar actuating mechanism of suchmachines wherein the vibrating movement of the type-bar is effected bymeans of a tension member moved from the key-lever, while the returnmovement of the type-bar to its position of rest is etleeted by thetension or pressure of a. spring acting in the opposite direction. Inknown mechanisms of this class the one end of the tension member whichis suitably connected with the type-bar engages the lower arm of thetype-bar which is formed as a bell crank lever. This arrangement permits, during the period of movement of the type-bar a favorable positionof the point of engagement of the tension member rela tive to the pivotof the typebar, only for a moment, as at the commencement of themovement the angle at which the tension member engages the type-bar armis somewhat acute and at the close of the movement passes into asomewhat obtuse angle, whereby the transmission of power, apart from theabove mentioned favorable middle position of the type bar, is notbrought; about favorably.

Now the object of the present invention is to remove the above mentioneddrawback so that the pressure or tension exerted on st.rik ing a keyalways acts uniformly favorably and regularly on the type bar from thecommencement to the end. The said object is realized by not having thetension member engage directly one arm of the type-bar but by letting itengage a pulley or toothed disk which is rigidly connected with thetypebar or is formed as the hub or boss thereof. \Vith such anarrangement the tension member (chain, cord, belt, or the like) engagingthe pulley or disk on transmission of the tension always assumes anequally favorable angular position relative to the lever arm of thepulley or disk moving the type bar and the power of the finger whichdepresses the key lever Will at any instant act favorably on themovement of the type-bar,

Specification of Letters Patent.

Patented Jun. 11, 1910.

Serial No. 3371089.

a circumstance which considerably increases the duplicating capacity ofthe machine.

In the accompanying sheets of drawings: Figure 1 is a plan ot a typewriting machine constructed in accordance with and embodying myinvention: Fig. 2 is a cross section o l the machine slmwing the typebar actuating ll'lt('lltl!ll$tlll.

Similar letters refer to similar parts in both of the Figures.

In the construction shown designate the base of the machine and l) themovable carriage in which is journaled on a horizontal axis the usualprinting platen u: The mechanism for operating the carriage and platenmay be of any preferred form and does not constitute a l'eature (it mypresent invention. The height of the axis of the platen and thecircumFerence ol the latter enter into the operation of the type bar andits operating mechanism as hereinafter described.

Mounted in front of the platen and projecting upward from the base are aseries of standards a arranged in a curved line. On each standard, inthe horizontal plane of the axis of the platen, is pivoted at one end atype-bar t, and in front of said standards and in said horizontal planeis a rest a for the free end of the typc-bars. ()n the supports 8 forthe rest 5 beneath each type-bar is cent ally pivoted a key-lever 7 thepower end of which is provided with the usual linger piece Z, while theload end Z is shown as extending above the pivot of the typebar. Fixedto each type-bar at its pivot is a pulley r, and surrounding each pulleyand fixed thereto at one point of its periphery, preferably by means ofa pin (1, is a tlexible member ll: which has one end secured to the loadend of the lever Z and its other end connected to one end of a coiledspring g, the free end of which spring is connected to a bracket gpreferably made in the form ol a shield and connected to the base A. Bythe above described arrangement it will be readily understood that whenthe finger piece is pressed down the load end of the lever Z is raised,and by means of the member 7a being fixed to the pulley r the latter isrotated, the spring distended and the type-bar swung from the rest 8onto the platen, as indicated in dotted lines. The tension of the springwill, when pressure is removed from the finger piece, return thetype-bar and lever to their normal positions.

With this invention the movement of the engage the periphery of theplaten above hey I ean be considerably reduced as on no count of theuniform transmission and distribution of the power the radius of thepulley r ran be eonsiderahly smaller than the usual aetuating' leverarm. llenee result extremely easy running of the met-hanistn and economyolf power with the possibility of letting the type bar rot-k not onlyaround an angle of about -15 as heretofore, but of inereasine' thisangle it need be to sueh an ex tent that the 1 vpebar describes almost asemi-eirele in moving from the rest a to the platen w. The practicalresult of this arrangement whieh would be impossible with levertransmission. is to inereztse the eapaeit v to talte earbon eopies. thatis to say, to tluplieate to an extent not heretofore obtained. and onthe other hand to enable the niaehine to be made of a tlatte' and moreconvenient portable form. Very important also is the feature that withthe present typebar meehanism the length of the type bars can heeonsiderably less than with known eonstrnetions. There is thus adiminution of the o eillation of the type-bar at the extremity :so thatspeeial guiding deviees for the t vpe-bars can be dispensed with.

l elaim:

1. In a t vpeqvritine maehine the combination with a platen, of atype-rest mounted in the htllllt horizontal plane as the axis of theplaten. a tvpe-bar pivoted between the platen and rest in said plane andadapted to said pivot, a key lever centrally pivoted below the rest, apulley fixed to the type bar at its pivot, a flexible member fixed toand surrounding the pulley having one end secured to the hey leverwhereby the downward movement of the power end of the latter will throwthe typebar onto the platen, and a spring connected to the other end ofthe tlexible member adapted to move the type bar from the platen t0 thetype-rest.

L. in a type-writing machine, the combination with a platen, of atype-rest mounted in the same horizontal plane as the axis of theplatetn a support for the rest. a type-bar pivoted in said plane between the platen and rest and adapted to engage the periphery ot' theplaten above the horizontal plane of the pivot, 11 key-lever pivoted onthe support below the rest and having its load end extending above thepivot ot' the type-bar, a pulley fixed to the typebar at its pivot, aflexible ntember fixed to and surrounding the pulley having one endseeured to the load end of the hey lever to move the latter from itsrest to the platen, and a spring connected to the other end of thetlexible member to return the type-bar to its normal position.

AUGUST FRIEDRICH \VlhHl'lhM .tlihlllS YUN Wllllllh.

\Vitneisses Max A. G. Lmtoitn, )rro \Y. ll'HLLTtlkltH.

